After a quarter-century of searching, scientists have nailed down how one particularly rare subatomic particle decays into something else — a discovery that adds certainty to our thinking about how the universe began and keeps running.Full story

GENEVA (Reuters) - Francois Englert, the Belgian physicist widely tipped to share a Nobel prize this year with Britain's Peter Higgs, said on Tuesday many cosmic mysteries remain despite the discovery of the boson that gave shape to the universe. Full story

The World Wide Web's first website celebrates its 20th birthday; a viewer points us to a very interactive website, HereisToday.com, that puts our place in the universe into perspective; and Mark Sanford debates his Democratic opponent Elizabeth Colbert Busch, and she gets a pretty good jab in.

A technician stands near equipment of the Compact Muon Solenoid experience at the Organization for Nuclear Research in the French village of Cessy near Geneva in Switzerland April 15, 2013. As hundreds of engineers and workers start two years of work to fit out the giant LHC particle collider to